Komatsu Galeo PC138US-8 Shop Manual page 213

10 Structure, function and maintenance standard
At high speed (the motor swash plate angle is minimized.)
1. 2nd travel speed select solenoid valve
2. Regulator valve
3. Spring
4. Check valve
5. Regulator piston
6. Swash plate
7. Parking brake piston
8. Hydraulic pump
9. Travel control valve
10. Pump merge-divider valve
11. Self pressure reducing valve
12. Brake valve
PC138US, USLC-8
When 2nd travel speed select solenoid valve
q
(1) is energized, the pressurized oil from self
pressure reduction valve (11) is fed to port (P).
Regulator valve (2) is pushed up with the pres-
q
surized oil that is sent to port (P).
The main pressurized oil from the control valve
q
passes through check valve (4), and passes
through oil passage (F) in regulator valve (2) to
control chamber (C), and is used to push to
regular piston (5) to the left.
Swash plate (7) reaches its minimum tilt angle,
q
and the machine travels at high speed with the
minimum motor capacity.
SEN02550-01
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